17. explain how the sport of pole vaulting dramatically changed when flexible fiberglass poles replaced still wodden poles?
-the fiberglass poles had more momentum and PE than still wooden poles?

20. does the international space station have gravitational pe? ke? explain?
-It has gravitation pe, but I am stuck as to why?

25. what does the work theorem say about the speed of a satillite in circular orbit? (this one I dont understand)

30.a moving hammer hits a nail and drives it into a wall. if the hammer hits the nail with twice the speed, how much deeper will the nail be driven? if it hits with three times the speed?
-would it be three times the speed

work = velocity^2
force*distance=velocity^2
distance is proportional to velocity^2
so what is twice square?

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